Check-link mechanism for weighing scales



May 12, 1925.

' H. O. HEM

CHECK LINK MECHANISM 'OR WEIGHING SCALES Filed Aug. l5, 1918 2 Sheets-Sheet 1 2 Sheets-Sheet 2 ffm tternuj fnf@ H. O. HEM

GHEGK Linx MECHAMSM Fon WEIGHING seal Filed Aug. 15, 19123 May 12, i9

I Ohio, lieve invented on?, n me? in, 323Mo.

.To @EZ who!" l t may com.:

Be it known that i, HAM/on C. citizen of the United States, resioing Toledo, in the eonnjv of Luoes e.

certa.; Improveznens in @heele for Weighing which is :i speeication.

is invention Fletes to 'weighinv' and more partioniarly so ehe' i f' ing ecoles. having' e. see-ie hee oommoditvreeeiving pietie ing pivots carried hy the'eeeie neem, such scales being faniiliariy known es courrier scales and used upon 'the counters of stores. shops, factories and the like. in scoiee oi this type having the plotter eupporod on two-point hearings it is necessary to employ .o check link mechanism to prevent the tip- E .et nd Stoie o5? inl ping of the piet/'rei'. when the .loefiio be. weighed is placed ndjaoen'f the 'eeiges 'iereov' and to insure the proper distribution oi wei ht upon the scale benin so hat the. com mo ity will Weigh the saine whether placed directly over the hearing pivots or et :i tance therefrom. The Check .link nie heretofore elnpioyefi has use ooneisefi o' a Cheek rod or link pivoinliy einehed o check post secured to the base or other sto tionary paro oi the see-.ie and s. post e ci. by the scale platier, his cheek iini; being or' the same length as the dirsi-ance between 'ii-he fnlozurn and the scale beam anni errang-eci et euoh an angle as to oiwaye maintain o peralielogrern.

In the present invenion I have devised n construction Working on o. dine-reni theory and one wherein the distance oem/"een the fulcrum and load-supporting pivots hears no relation to the maintenance of the pintform in horizontal osiion, In 'the p construction snoh @langes es would render inaccurate the oiol oheelr iinh', es the platform-snpporing pivots of glass,

i. company, .or

.ne iever or "ehe posi: due to the wear oie, eie. wili not affect the length ie noo and other objects in view *i iviil reociiiy appear as the invention is :,Cieistoocl, roy invention consists in vai eonetruoion, ooinhination and arrangement of pare to he hereinafter more iniv defierihed and particularly pointed out ieno'eri olonne. -nce ne i io the accom any- I ing' a preerr emvention and wherein simiei renee numerals desi i nate Similar ighon 'iie severall views.

d wn ny improved che eing hrolren away and ire Eis a deiail pian view of the phi:` iporting ironie andv upper check link .n eored therewith; Figure 3 is a vertical sectional view taken line (j: n

"1 f# ignre 4: 1e oeeii section teken on he iine i-Li of Fi enloeantieliy on the n ,u l Ji ire o e detail plan view of the lower;v ein ink member; en

. gure 5 ie e detail eootion taken substanizlliy on the line G-J of Fig. 3.

En the drawings, the numeral 5 the bese of the and 6 the housing thereof. Formeel. on the base 5 are the usual bise horns supporting the scale beam 8. The eonnnoditvreeeiving plat-ter 9, preferably of rests upon thesupportig frame 10 which is provided with resilient lugs 12 for engagement with the latter. A suitable looking screw 13 may a so be employed for holding the platter upon the frame. The

1 preferably comprises spaced side 's ifi; eoioieotofl by a central croesbar Sint the center of. which depending post. 16. The side 1 oi he *rome preferably carry riding legs 17 supporting erop carrying pivots lofo: eng he 'oiver 'extremity of links 20 olv/oie of he scale beam 8.

may he of agate, hardened sicie elevation of a wtilig v` 3--3of11fige1lw subshn-I' designates .1.05 e), iipper portion of which if DI' roetingupon the plntforxn-` v 'era-bly mounted upon 11107)'.

pin 23 arranged at right angles to the line of contact of the bearing with the platformsupporting pivot 22, thereby permitting movement of the link relatively to the pivot 22 in anyvdirection. The construction of a platter-supporting frame of this type permits great width between the platform-supporting pivots of the scale beam, and to insure lateral stability at all times a crossb'ar 24 may be arranged to connect the links 20 on the opposite sides of the frame (see Fig. 3).

As herein shown, the post 16 is formed with an enlarged upper' portion 25 hollowed to receive lead, etc. to properly balance the lever 8 and the parts carried thereby relatively to the load-offsetting element of the scale, and the lower yportion of the post is threaded into the enlarged upper portion for vertical adjustment, substantially as shown in Fig. 6. A locking nut 26 may be provided to maintain any desired adjustment. The en- ',largedportion of the post 1G is pivotally conneeted, as shown in F 1g. 6, with one, end of the upper check link member 27, the'other extremity -of which extends within the housing 6 and is pivoted to the bracket 28 carried by such housing (see Figs. l and 2). The lower end of the post 1G, as shown, is provided with a' knife edge pivot Q9 mounted for vertical adjustment in such post and having its knives 30 facing in opposite directions on opposite sides of the post (see Fig, 5). Spaced check members 31 forming the lower check link connect the knives 30 with similar knife edges in a pivot 3Q mounted for vertical adjustment on a bolt 33 carried by the pivoted arm 34 (see Fig. l). -.'l`he arm 34 is preferably pivoted in a bracket deably mounted in the between the The placing of the commodity to be weighed d that the check In operation,

pending from the scale base and its free end is raised or lowered by rotating adjusting bolts 36 or 37 threaded into trunnions rotatarm 34. The distance knife edges of the pivot 29 and the pivot 32 of the lower check link is equal to the distance between the pivotal connections of the upper check link Q7 with the 'postili and bracket 28 respectively, and the vertical adjustments are so made that a parallelogram is secured withthe upper and lower vcheck links and the post 16 forming three sides thereof. rlhis parallelogram will be preserved despite wearing` of the fulcrum or platform-supporting pivots of the scale beam, warping of the scale beam, etc., and owing to the great length of its horizontal sides will give marked stability to the platter. Y the inner` end of the scale beam 8 within the housing 6 is connecter with a `steelyard rod 38, etc. through which engagement is made with the pendulum or other load-offsetting mechanism of the scale.

upon the lplatter 9 will cause the inner en of the scalebeam to swing downwardly ex- 1 necting means erting a pull upon the steelyard rod to op crate the pendulum or other load-offsetting mechanism to counterba-lance the weight of such commodity, and through suitable indieatingT means the weight .of the commodity is shown. 'lhe lowering movement of the platter 9 carries with it the post 16 'and rocks the upper and lower check links 27 and 3l on the bracket 28 and anchor pivot 3Q resjieetively, these check links rocking through the same are and thus maintaining the parallelogram at all points during the travel of the platter. It will be noted that the check links 27 and 3l swing through an are extended in the opposite direction vto the arc traversed by the scale beam 8.

While it will be apparent that the illustrated embodiment of my invention herein disclosed is well calculated to adequately fuliill the objects primarily stated, it is to be understood that the invention is susceptible to variation, modification and out departing from the spirit and scope of the invention as set forth in the subjoined claims.

Having described my invention, I claim:

l. A check link mechanism for scales, comprising a scale frame, a lever fulcrumed thereon, a platform supported by the lever at a point located at a distance from the lever fulcrum, a pair of spaced check links of equal length extending from the platform in the direction opposite that of the lever fulcrum and connected with the platform and scale frame, and pivoted link connecting means between said'check links and said lever permitting free eccentric movement of said check links and said lever.

2. A check link mechanism for scales comprising a scale frame, a lever fulcrumed thereon, a platform supported by the lever at a distance from the fulcrum, a pair of spaced check links of equal length connected with thel platform and scale jframe, and means for adjusting said check links vertically and laterally. f

3, A check link mechanism for scales comprising a scale frame, alever fulcrumed thereon, a platform ,supported by the lever at a distance from the fulerum, a pair of spaced check links of equal length connected with the platform and scale frame, and means carried by the scale frame for adjusting one of said'check links vertically and laterally. v

Il. A check link mechanism for scales comprising, in combination, ya scale frame, a lever -fulerumed thereon, a platform, confor supporting the platform by said lever at a distance from the fulcrum, and a pair of spaced check links of equal length connected with the platformV and scale frame, the arrangements being such links swing through arcs curved reversely to that traversed by the change withlever, said connecting means permitting eccentric movement of said platform and said lever.

5. In a scale, a sup orting frame, a lever pivoted thereon, a p atform, Va check link mechanism co-operating With said lever and platform, comprising a frame suspended from the lever and supporting the platform, a 'postrigid with the platform, and a pair of check links connected with the supporting frame and- With said post at diiferent heights.

6. In a scale, a supporting frame, a lever pivoted thereon, a platform, a check link mechanism co-operating with said lever and platform, comprising a Wide frame supporting the platform, means for suspending said frame from the lever, a depending member rigid with the platform, and a pair of check links connected with' the supporting frame and with said post at different heights.

7. In a scale, a supporting Jframe, a lever pivoted thereon, a. platform, a check link mechanism cao-operating with said lever and platform, comprising a Wide frame supportingV th'e platform, a pair of links for ,suspending said frame from the lever, a post rigid with the platform, and a pair of check links connected with the supporting frame and vwith said post at different heights.

8. In a scale, in combination, a supporting frame, a lever fulcrumed thereon, pivots rigidly secured to said lever, links suspended from said pivots, means rigidly connecting said links, anda platform supported by said links. i

9. In a scale, a supporting frame, a lever fulcrumed thereon, a platform supported by the lever, check links placed one above the other forstabilizing the platform, and adjustable connections for the check links to the platform and frame whereby the check link mechanism will form a parallelogram.

lO. In a. scale,in combination, a supporting frame, a lever fulcrnmed thereon, a load pivot on said lever at a distance from the fulcrum thereof, a'platform supported by said load pivot pivoted'link mechanism for holding said p atform against tilting, said pivoted mechanism swinging through an arc the radius of which is greater than the distance from the lever nlcrnm to the load ivot, and link connecting -means permitting ree eccentric movement of said pivoted lin mechanism and said lever. f

ll. In a scale, in comb' ing frame, a lever talc pivot on said lcv on said load pivot ing said platformv aba ng, said mechanism swinging tl'irough an arc of opposite curvature to that tra versed Aby the load pivot and connecting means permitting free eccentric movement ot said link mechanism and said lever.

l2. In a scale, in combination, a iframe, a lever 'ulcrumed thereon, a load pivot on said lever, a platform, means connecting said platform and said load pivot, means for causing said platform to swing about an arc different from thev arc traversed bv said load pivot, said means maintaining said platform in horizontal position the parts being so constructed and arranged as to permit free eccentric movement et said platform and said lever.

i3. In a Weighing scale, in combination, a supporting frame, a system of links connected thereto, said system including a pair of substantially horizontallyextending links of equal length pivoted to said supporting frame, a commodity-receiver connected to said system of links and held in horizontal position thereby, a lever pivotally mounted on said -frame to swing eccentrically to said links, and supporting' connections between said system or' links and said lever.

le. In 'weighing scale, .in combination, a rigid supporting iframe, a deformable frame connected thereto, said deformable frame including a pair of substantially horizontally extending links oi? equal length pivoted to said .rigid supporting frame, a commodityrcceiver supported by said deformable traine, a lever pive'ted upon said rigid 'frame to swing i' frame, and supporting connections between said lever and said deformable trame.

HALVQ HEM.

nation, a snpperted thereon, a load platform sin ported TWitnesses:

GEORGE R. n, Frnnors @om eccentrically to said deformable 

